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Table 1 Examples of technologies for the removal or mitigation of arsenic [Sources: [26, 27]]

From: Are interventions to reduce the impact of arsenic contamination of groundwater on human health in developing countries effective?: a systematic review protocol

Technology (Intervention) Mechanism of action
Pre-oxidation of arsenic(III) to arsenic(V) By transforming to one form of arsenic, simplifies arsenic removal by other means
Precipitation and coagulation Co-precipitation of water insoluble arsenates and inorganic oxides of other metals
Adsorption Granular adsorptive media
Membrane Filtration, electrical repulsion and adsorption
Ion exchange Water passes through an ion exchange resin which removes arsenic by exchanging it for non-toxic ions.
Biological removal Sorption and oxidation, e.g. through bacteria, fungi and hyacinths
Dugwell The top of shallow aquifers, at less than 10 m, appear to be less contaminated than deeper water.
Deep tubewells Tubewells sunk below the layer of sediment considered to contain arsenic
Reverse osmosis Contaminated water is forced through a membrane. The treated water passes through leaving the arsenic ions on the membrane
Nanofiltration Similar principle to reverse osmosis, with a nm pore size